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Interleaver design for IEEE 802.11n standard

a technology of interleaver design and 802.11n, applied in the field of data communication, can solve the problems of insufficient flexibility of transmitters and insufficient utilization of diversity gain, and achieve the effect of expanding space frequency diversity gain

Inactive Publication Date: 2007-06-07
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an interleaver design for a transmitter that can accommodate different channel coding and modulation schemes on different special streams while exploring larger space frequency diversity gain. This improves the performance of a MIMO wireless system by increasing the diversity of the wireless system. The receiver of the system has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.

Problems solved by technology

As a result, in a correlated channel, the diversity gain is not fully utilized.
However, such a transmitter is not flexible enough to accommodate different channel coding and modulation schemes on different special streams.

Method used

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  • Interleaver design for IEEE 802.11n standard
  • Interleaver design for IEEE 802.11n standard
  • Interleaver design for IEEE 802.11n standard

Examples

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Embodiment Construction

[0021] In one embodiment, the present invention provides a method of bit stream interleaving for a MIMO system. The interleaving method increases the column rotation to the largest possible distance within a block to fully explore the diversity of the wireless system.

[0022]FIG. 1A shows an example block diagram of an OFDM MIMO system 100 (e.g., 20 MHz channel) implementing WLAN 802.11n, according to an embodiment of the present invention. The system 100 includes a transmitter 101 and a receiver 102. The transmitter 101 comprises a channel encoder 103, a puncturer 104, a spatial parser 106, and two data stream processing paths 107. Each data stream processing path 107 comprises an interleaver (e.g., interleaver 108A for a first processing path, and interleaver 108B for a second processing path), a constellation mapper 110, an IFFT function 112, and guard interval insertion window 114 and an RF modulator 116. For the parser 106 and the interleavers 108A, 108B portions of the transmit...

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Abstract

A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column rotations and row rotation, to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to data communication, and more particularly, to data communication with transmission diversity using Orthogonal Frequency Division Multiplexing (OFDM) in multiple antenna channels. BACKGROUND OF THE INVENTION [0002] In wireless communication systems, antenna diversity plays an important role in increasing the system link robustness. OFDM is used as a modulation technique for transmitting digital data using radio frequency signals (RF). In OFDM, a radio signal is divided into multiple sub-signals that are transmitted simultaneously at different frequencies to a receiver. Each sub-signal travels within its own unique frequency range (sub-channel), which is modulated by the data. OFDM distributes the data over multiple channels, spaced apart at different frequencies. [0003] OFDM modulation is typically performed using a transform such as Fast Fourier Transform (FFT) process wherein bits of data are encoded in the fr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L1/02H04K1/10
CPCH04B7/0689H04L1/0041H04L1/0071H04L1/0606H04B7/0413H04L5/0007
Inventor OUYANG, XUEMEINIU, HUANINGNGO, CHIU
Owner SAMSUNG ELECTRONICS CO LTD